I dreamed about killing my principal, despite never even hating him.
Dreams about killing someone, especially someone you normally wouldn't want to harm, can be quite disturbing. However, such dreams rarely reflect violent tendencies in real life. Instead, they often symbolize a desire to assert power or control in a situation where you may feel powerless or overwhelmed.
In the context of your dream, the principal may represent authority figures or rules that you feel constrained by in your waking life. Killing him in the dream could be a way of expressing a subconscious desire to break free from these constraints or to challenge authority in some manner.
It may be helpful to reflect on any areas of your life where you feel restricted or controlled, and think about ways you can assert your independence or speak up for yourself in a healthy and constructive manner. It could also be beneficial to consider discussing these feelings with a therapist or trusted individual to gain further insight into the underlying emotions driving the dream.